The 1999 Honda Foreman 400 typically uses a 12-volt lead-acid battery, with the most common replacement being a YTX14-BS group size. Always verify the exact fit by checking the existing battery label or your owner's manual.
Understanding the right battery size for the Foreman 400
For this ATV model, the critical factor is the battery’s group size (the physical case size and terminal layout), not just the voltage. The YTX series is the standard naming you’ll see in parts catalogs. While YTX14-BS is the most frequently recommended size for many Foreman 400 owners, there are occasional fittings for other sizes depending on production year, regional specs, and aftermarket options.
Common options you might encounter when shopping for a replacement include:
- YTX14-BS — a common, well-fitting choice for the Foreman 400 in many markets.
- YTX12-BS — may fit if the battery tray and terminals align with the smaller case.
- YTX20-BS — larger option that can fit some variants, but not all Foreman 400 trays will accommodate it.
Choosing the right size isn’t just about the voltage; you must ensure the physical dimensions and terminal orientation match your ATV’s battery tray and cables.
How to verify and replace the battery
If you’re replacing the battery, follow these steps to confirm you select the correct size and a reliable unit.
- Check the existing battery label for the exact group size (for example, YTX14-BS) and any CCA/RC specifications.
- If the label is unreadable, remove the battery and measure the case dimensions (length, width, height) and compare them to standard YTX14-BS, YTX12-BS, or YTX20-BS dimensions from a parts catalog.
- Inspect the terminal layout (positive/negative positions) to ensure the new battery uses the same arrangement as the old one.
- Consult the owner’s manual or a Honda parts catalog by model year to confirm the recommended group size for your specific market and VIN range.
When in doubt, consult a parts counter with your ATV’s year, model, and market region; they can confirm the correct group size and help you avoid misfits.
Summary
The 1999 Honda Foreman 400 generally relies on a 12-volt lead-acid battery, with YTX14-BS being the most common replacement size. Always verify the exact fit by inspecting the old battery label, measuring the case, and consulting official manuals or a reputable dealer. Ensuring the correct group size and terminal configuration will help maintain reliable starting performance and avoid fit-related issues.